A Two-stage Precoding Method for Multi-gateway Multi-beam Satellite System

In this paper, the design of precoding method for multi-gateway multi-beam satellite system is considered. A two-stage precoding framework is proposed, which composed of the on-ground precoding in feeder link and the on-board precoding in user link. We first propose the on-board precoding method based on successive interference cancellation (SIC), which the precoding sub-matrix is designed in sequence. Then based on the long-term statistics of the effective channel, the on-ground precoding can be obtained to maximize signal to leakage plus noise ratio (SLNR). The performance of the proposed schemes through simulations is demonstrated.